Setup your ExLink configuration. you might have already debug mode enabled but forgotten later...
You needed to close that gate quickly after opening TV. That will enable debug mode.
Just needed to connect those terminals with wire, coin, bolt, or anything conductor. For avoid shot circuit, you might want to use duct tape and paper that will cover other areas...

Nice video
What you doing wrong in my opinion -
1. Power OFF TV (from electricity)
2. Make short and do not release it
3. Power ON TV
4. Watch what is going on terminal.
If nothing happends
5. Release short connection
6. Watch what is going on terminal.